Both instances will probably be a shop minimum of $80 to the customer. Doesn't matter to me if my repair bill is more parts cost or more labor cost. Full disclosure I don't change my own car oil, I don't repair my own appliances, I hire people to cut the limbs off my trees. I do understand if you have the ability and desire to do the work yourself then $.75 is of course better than $30. But I just don't believe the average guitar player is an electronics repair person. The repairability issue is true theoretically, but in practice the repair shops around here are piled high with amps and a three week turnaround.